Yeah i greased the lead screw and it didnt help. Also its definitly not the limit switch as that would give a prompt saying limit is hit. And I’m definitely not going to buy another driver to fix an issue that came stock with the unit!. If the only way i can travel at designed speed with the Zaxis in the up direction is to have the High Powered Z Driver, then this should come with the unit stock.
Very disappointed that the unit is designed so tightly that a small backlash nut can stop the Z axis completely if its slightly turned. Backlash nuts tend to need to be retightened and this means there will be a high probability that this nut will fall back into this position down the road an during a part run.
Buying a brand new machine and worrying from day 1 that the the z will not move up when it should is not something that should happen. if there is that little margin in the power of the Z driver that’s really sad. design should always have some safety factor especially for such critical parts.